Insulator



' W. SCHAAKE.

INSULATOR.

APPLICATION FILED APR. 5. 19!].

ATTORNFY INVENTOR VVf/l Mm Sc/iaafe.

Patented Dec. 28, 1920.

WITNESSES WILLIAM SCHAAKFQ OF P HOUSE ELECTRIC & 111.212? U'Fi'l. SYLVANIA.

INSULATOB.

naeaova.

Application filed frpril 5, 1317.

To all whom it may concern Be it lrnown that I, YVILLIAM citizen of the United States, and of l ittsburgh, in the county of and State of Pennsylvania, have inx a new and useful Improvement in insulat rs, of which the following is a specification.

hly invention relates to electrical i1 sulators and pa ticularly to insulators that are adapted to support conductors for carrying high-voltage currents.

The object of my invention is to provide an improved insulator of the above-designated type that shall embody a minimum amount of metal and cementing material.

Heretofore, it has been found that the Xpa -sion and contraction of a large body of embedded metal tends to impose severe strains upon the insulating body in which such 1 ietal is embedded and eventually causes a break-down of such insulating body. Fr therinor the cementing mater l, which 1 usually employed for embeddin one metal L hangers of such insulators, is hydroscop and tends to absorb moisture from the atinosphere, which, during cold weather, freezes and materially weakens the insulating structure.

An insulator constructed in act with my invention avoids the evils before set forth by su ounding the suspc i sion pin with a busl g of vitreous material and securing the pin and bushing in a recess in the insulator by means of a thin layer of cementing material.

Figure 1 of the accompanying drawing is a central sectional view, partially in side elevation, or. an insulator constructed in accordance with my invention; 1 2 is a view taken on the line Ill-H oi l; and

navir L c ap to Specification of Letters Klee. 2S, 1920.

o i porcelain or other vitreous mat hing 6 is 01"- just sufficient size d into the recess 3 wiien dis- "ne shank of the pin 4: and is into complementary por- "n assembling. A small aperoetween the contiguousporushing to admit cement- 8, or

I that is used for securing the il place. T he outer 6 is serrated, as is K face of t 3, in order that the layer or cement may be very thin and yet en body sun lent inateria to i ithstaud Al til-8 'ess imposed upon the supporting pin iall pad 10 oi felt, or other resilient may be positioned at the bottom 'cess in err, take up s rains by the expansion and contraction d of the e-piece bushing 6 is comprises two separable inc nut 11 is secured to a threaded the pin and constitutes a susion means for supporting cables or other sulator is assembled by placing the "he l ushin 6 within the recess 3 n ing material 8 into the -e porcelain bushing and -lze ii ilator i. no bushing G is prefercon posed of mat rial that is substanily more durable than cement and more able to withst nd the strain upon the head 5 without rupture.

TU, v F! T l "I, PM! 1 v iiitrio r n 1 nave aesciio n my invention and pret'errec form, I desire it ited only in accordance with the nd scope of the appended claims. claim a my invention:

suspension insulator comprising an no; member provided with a recess 0 substantially nnirorni cross sectional area u "s length, a pin havii a head a J lly the same cross sectional area as too recess, and sleeve cemented in said holding said pin.

spension insulator comprising an iieinber provided with a recess of suostantiai uniform cross sectional area throughou its length, a pin having a head at one end of substantially the same cross sectional area end, and a sectional sleeve cemented in aid recess for holding said pin. i suspension insulator comprising an insulating member having a recess of substantially uniform cross sectional area from end to end, a sleeve aving a transverse shoulder cemented in position in the recess, a pin t sposed in the sleeve and provided with n erns extending substantially over the entire area of said shoulde and of the recess for transmitting the pulling forces of the pin to said sleeve.

suspension insulator comprising an member having a 'ecess of sul iv uniform cross sectional area from a l 'e if insulating material i i e shoulder emented in n in the recess, a pin disposed in the y and provided with means extending l v entire area of said :cr and of the recess for transmitting iorces of the pin to said sleeve. uspe sion insulator comprising an i aber having a recess of subi: 'ly Ullilfol'ill cross sectional area from er cemented in position in the recess by a relatively thin body of cement, a pin ti o e in the sleeve and provided with ,4 A

'- "tantialiy over the enl oi said shoulder and o the recess L ing the nulling forces the meia y llllll Ollil cross secthroughout its length, asleeve a tra sv rse shoulder cemented in "1 1n a pin disposed in the S.Z\,Qv and provided with means extending iiistantially over the entire area of said shoulder and of aid recess for transmitting the longitudinal main-load forces of the pin to said shoulder.

7. fin insulator c mprising an insulating member provided with a recess having subtantially uniform cross sectional area from he recess,

cal to end, a bushing having its outer surrace relatively close to the surface of said recess anc cemented thereto and a pin havmg a 1 al ot substantially the same cross e sectional area as the bushing and held in said recess by said bushing.

8. suspension insulator comprising an insulating membe provided with a recess havin substantial uniform cross sectional area from end to end, a pin disposed in said recess and having; a head of substantially the same cross sectional area as said recess, a bushing embracing the pin and having its outer surface relatively close to the siirface of said recess, and a relative y thin body of cement cisposed between said bushing and said insulating niei iber.

9. it suspension insulator comprising an insulating member provid d with a reccss iaving substantially UlllOl'lll cross sectional area lfrom end to end, a pin disposed in said recess and having a head of substantially the same cross sectional area as said recess, a bushiu of substantially the same coe'liicicnt of expansion as the insulating membe and embracing the pin and having its outer surface relatively close to the surface oi he recess, and a relatively thin body of cement diseosed in said recer's and en aging said bushing and said insulating member.

10. A suspension insulator comprising an insulating member pr'vided With a recess having suliistantially unilerm cross sectional area from end to end, a pin disposed in said recess and having a head of substantially the same cross nectional area as said re rose, a bushing embracing the pin and having its relatively close to the surface and a relatively thin body of osed betvcei said bushing and havrig its bearing surrace substantially t angles to the axis of said pin, and a bushrig enoracin said pin and having a surface suo intially at right angles ixis of the pin raving its outer surtively clo e to the surface of said re- 1 o. cemented thereto. 12. in a suspension insula or, the combination with an ins member ha dug a recess, of a tension Linal device cemented in position in the i and comprising a pin having a trans :crse projection and a sleeve surrounding the pin and having a transverse eat for the projection, the external diameter and length ot the sleeve being nearly equal to the corresponding dimeiian d "rinal device may be effected Without injury to the insulating member in case the cement becomes ruptured or (let ched.

In testimony whereof, I have hereunto subscribed my name this 26th day of March, 191i.

SCHAAKE. 

